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Activating Clean URL's

The clean URLs (permalinks) are mandatory for the theme installation/update

If your WordPress installation uses the default permalinks setting, on the theme configuration panel, you will have this warning: 
To fix this problem, simply click on "Fix it for me" button. 
You can also fix it by your own, visiting the WP Admin > Settings > Permalinks and selecting the "Post name" option. 

The importance of the clean URLs (permalinks) for SEO

For a better search engine indexing, your installation needs to have a friendly permalink structure. By default, the WordPress use the "plain" setting.  A friendly/clean URLs contain keywords that explain the article, and they’re easy to read by both humans and search engines.